PURPLE DRAGON
Fantastic baby's member's club!
http://www.purpledragonplay.com/blog/?cat=4

MONKEY MUSIC
Music and singing classes from birth
http://www.monkeymusic.co.uk/

GYMBOREE
Great baby group classes from 0 up to 5 years  http://gymboree-uk.com/

LONDON TRANSPORT MUSEUM
http://www.ltmuseum.co.uk/

BACH TO BABY
Great classical music concert for babies and parents 
http://www.bachtobaby.com/